Froth flotation of sulfide ores in the presence of a n-dichlorothiocarbanilide



Patented Jan. 11, 1949 IUNITTEDSTATES PATENT orrics FROTH FLOTATION' F SULFIDEv ORES IN THE PRESENCE OF A N-DICHLOROTHIO- CARBANILIDE Rhetheri'ord B. Martin, New York, N. Y., assignor to Kennecott Copper Corporation, New York, N. Y., a corporation ofNew York No Drawing. Application October 5, 1945, Serial No. 620,648

3 Claims. (Cl. 209-166) This invention relates to the concentration of ores and has for an object the provision of certain improvements in concentration operations. More particularly, the invention contemplates the provision of certain improvements in flotationagitated with 10 c. c. of sodium hydroxide. 20

The flotation reagent may be employed advantageously in neutral, alkaline and acid circuits. It may be employed advantageously in froth flotation operations designed for the concentration of both non-metallic minerals and metallic minerals and in froth flotation operations designed for the concentration of both oxidized ores and sulphide ores. The reagent can be employed with particular advantage in froth flotation operations designed for the concentration of sulphide ores.

The following examples illustrate the advantages of the reagent of the invention over reagents employed heretofore. The ore employed in the 'tests was Braden Copper Company ore containing on the average about 2.16% copper in sulphide form and about 0.21% copper in non-sulphide form and containing small amounts (about 0.075%) of molybdenite (M032). The ore was ground to 2.5% plus IOU-mesh in all cases.

Example 1 Total Concta, per Tails, 1. r Recoveries, Mineral Cob LIL/um cost of cent cent percent lectors Req'd I ore Cu Mos, Cu M08 Cu M05;

,19. 681 18 015 92. 36 81.28 Standard 16 1 24 24. 03 645 24 .025 89. 76 69. 76 l6 13. 70 550 .11 019 95. 72 83. 88 1. 148 24. 15 644 22 025 90. 64 69. 93 1. I153 17. 20 617 14 014 94. 63 86. 10 I16 .151 5186' .756 .21 .024 01. 05' 69.

Ez'ample z Total Concta, per Tails, per Recoveries, Mineral COL Lb'lbon cost of cent cent percent lectors Req'd 525 ore Cu MoSi Cu M081 Cu M08:

18. 60 650 14 022 94. 40 78. 93 Dichloro thiccarbanilid. 10 071 24. 80 750 42 028 82. 43 68'. 04 Do i0 18. 611 13 015 94. 83. 65 NaCl 1. 50 095 24. 40 617 30 02S 87. 58 65. 63 Dichloro thiocarbanilid- 10 17. 75 638 15 016 94. 05 84. 21 NaOl i. 50 Kerosene 16 0976 24.15 789 25 020 89. 37 77. 43

No solid was at first precipitated, but, after the addition of 20 c. c. of water and again shaking. mm-dichlorothio-carbanilide was obtained in quantitative yield.

This method of preparing the compound is described in the Journal of the Society of Chemical Industry, vol. 45, 1926, page 351T.

The upper figures in the above tables indicate 50 results obtained with Fagergren flotation machines, and the lower figures indicate results obtained with Minerals Separation flotation machines.

The standard reagent referred to in Example 1 56 is a well-known mineralcollecting agent (ethyl 3 xanthogen ethylformate) accepted at the time of the tests as being the most effective in treating the ore tested, and the amounts indicated were the amounts considered to be most suitable.

I claim:

1. The method of concentrating sulphide ore which comprises subjecting the ore in the form of a pulp to a froth flotation operation in the presence of a chlorinated thiocar-banilide comound in which a chloride atom is attached to a nitrogen atom.

2. The method of concentrating sulphide ore which comprises subjecting the ore in the form of a pulp to a froth flotation operation in the presence of dichloro thiocarbanilide in which chlorine atoms are attached to nitrogen atoms.

3. The method of concentrating sulphide ore which comprises subjecting the ore in the form of a pulp to a froth flotation operation in the presence of a compound having the following structural formula:

CHECIN \C=S CaHLCIN v RHETHERFORD B. MARTIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Certificate of Correction Patent No. 2,458,523. January 11, 1949.

RI-IETHERFORD B. MARTIN It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 3 line 10 claim 1 for the Word chloride read chlorine;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 31st day of May, A. D. 1949.

[sun] THOMAS F. MURPHY,

Assistant Oommz'ssz'oner of Patents. 

